"A being that broke through a dimensional barrier between the worlds. Completely alien in nature, it has a violent and agressive temper. It relentlessly attacks its enemies with its four stong arms."
This Boss is fairly easy, though you only have Koudelka to fight, she should have a lot of VIT and around 2,000 hp, so just attack it with Tornado, don't worry about running.
Gug is another reference to the works of H.P Lovecraft, and is a race of creatures described of as giants and having "(a) mouth (that) had great yellow fangs and ran from the top to the bottom of the head, opening vertically instead of horizontally."
| Barrels | Black Cat | Brute | Chikon | Sucker | Crates | Demonic Bead | Explode Corpse | Eyeball | Face | Ghoul | Giant | Giant Roach|
Hand of Glory | Headless Corpse | Corpse Hound | Inverse | Jester | Sham | Mars | Minotauros
Nobleman's Spirit | Possessed Armor | Possessed Chair | Possessed Shelf | Possessed Table | Pricktail | Puppet | Raven | Shadow | Skeleton
Spectre | Tamacoss | Vine | Watcher | Wight
| Werewolf | Giant Plant | Seeker Trio | Mummy Bride | Doppelgänger Koudelka | Doppelgänger Edward | Doppelgänger James|
Jailer | Mad Fly | Dark Young | Alias | Chimera | Gargoyle | Gug | Valna and Vigna | Charlotte's Wrath | Scapegoat | Apostle | Patrick's Vine
Elaine | Elaine (Final Form)